Katherine Kelly Lang (born Katherine Kelly Wegeman on July 25, 1961) is an American actress. She was born in Hollywood, California. She is the daughter of Olympic long-jump skier Keith Wegeman and actress Judith Lang.

Her first movie credit was a movie called Skatetown U.S.A. (1979), with Scott Baio, Mark Hamill, and Patrick Swayze. Most of the '80s were spent filming B-movies with up-and-comers such as Tom Eplin, David Faustino, and Mariska Hargitay.

In 1987, she was offered the part of middle-class Brooke Logan on the soap opera The Bold and the Beautiful. She's been an integral part of the program ever since. Her love affair with Ridge Forrester (played by Ronn Moss) has been a key story for over seventeen years. The love triangle between Brooke, Ridge, and Taylor (Hunter Tylo) was a story that stretched across an entire decade.